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According to the FreeBSD kernel malloc man page the allocator is expected to return power of two aligned addresses for allocations up to one page size. While it also states that this shouldn't be relied upon, at least our (directly copied) bus_dmamem_alloc expects it and drivers may depend on it as well. Looking through the FreeBSD commit logs, this expectation seems to be rooted quite deeply. This fixes watchdog timeouts in the ipro1000 driver under KVM and may help with #11953. It might also be related to #9099 and #9601 as those seem memory allocation related as well.